CN113296252B - Zoom lens - Google Patents

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CN113296252B
CN113296252B CN202110564214.1A CN202110564214A CN113296252B CN 113296252 B CN113296252 B CN 113296252B CN 202110564214 A CN202110564214 A CN 202110564214A CN 113296252 B CN113296252 B CN 113296252B
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lens
lens group
zoom lens
zoom
focal power
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CN113296252A (en
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姜月
王立忠
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Jiangxi Phoenix Optical Technology Co ltd
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Jiangxi Phoenix Optical Technology Co ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144113Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
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Abstract

The invention discloses a zoom lens, which comprises a first fixed lens group, a zoom lens group, a second fixed lens group, a focusing lens group and an optical filter, wherein the first fixed lens group, the zoom lens group, the second fixed lens group, the focusing lens group and the optical filter are sequentially arranged from an object side to an image side along an optical axis; the zoom lens further satisfies the following condition: FA/FC is more than or equal to 1.32 and less than or equal to 1.97, FB/FC is more than or equal to 0.9 and less than or equal to-0.18,0 and less than or equal to FD/FC and less than or equal to 1.1, wherein FA is the focal length of the first fixed lens group, FB is the focal length of the zoom lens group, FC is the focal length of the second fixed lens group, and FD is the focal length of the focusing lens group. The lens has excellent confocal imaging capability under visible light and infrared light, has a temperature compensation function, does not need to be focused again when switching day and night, has clear imaging, small volume, large image surface, wide application range and low cost, and can be matched with various types of camera equipment to meet various use requirements.

Description

Zoom lens
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a zoom lens.
Background
With the development of the AI face recognition technology, the zoom lens is beneficial to further improving the development application space in the field. But the AI face recognition field needs to be based on clearer images to realize excellent recognition accuracy and processing efficiency. Therefore, higher requirements are put on the diaphragm, the image plane, the resolution, the infrared performance and the high and low temperature performance of the camera lens. However, the currently used lens generally has the following disadvantages: the aperture is small, and the requirement of an image on brightness in a low-illumination environment cannot be met; the large image plane and the small volume can not be considered at the same time, and the space requirement of the lens can not be met; the resolution ratio is low, the resolution ratio of the current mainstream 1080P lens is 200 ten thousand, and obviously, the requirement of face recognition on high pixels cannot be met; the infrared performance and the high and low temperature performance cannot be considered at the same time, the day and night confocal requirement is often met by sacrificing the high and low temperature performance, the real-time requirement of face recognition under the high and low temperature environment cannot be met, and the stable working performance is difficult to guarantee.
Disclosure of Invention
The invention aims to solve the problems, provides a zoom lens, realizes excellent confocal imaging capability under visible light and infrared light, has a temperature compensation function, does not need to refocus when switching day and night, has clear imaging, small volume, large image surface and wide application range, can effectively improve light transmission efficiency and reduce production cost, can be matched with various types of camera equipment, and meets the use requirements.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a zoom lens, which comprises a first fixed lens group, a zoom lens group, a second fixed lens group, a focusing lens group and an optical filter, wherein the first fixed lens group, the zoom lens group, the second fixed lens group, the focusing lens group and the optical filter are sequentially arranged from an object side to an image side along an optical axis;
the zoom lens further satisfies the following condition:
1.32≤FA/FC≤1.97,-0.9≤FB/FC≤-0.18,0≤FD/FC≤1.1
the FA is the focal length of the first fixed lens group, the FB is the focal length of the zoom lens group, the FC is the focal length of the second fixed lens group, and the FD is the focal length of the focusing lens group.
Preferably, the zoom lens further satisfies:
0≤FW/FC≤0.5
where FW is the wide-angle end focal length of the zoom lens.
Preferably, the first fixed lens group has positive focal power, the zoom lens group has negative focal power, the second fixed lens group has positive focal power, and the focusing lens group has positive focal power.
Preferably, the first fixed lens group includes a first lens having negative optical power, a second lens having positive optical power, and a third lens having positive optical power, which are arranged in order from the object side to the image side;
the zoom lens group comprises a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with positive focal power which are arranged in sequence from the object side to the image side;
the second fixed lens group comprises a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with positive focal power and a tenth lens with negative focal power which are arranged in sequence from the object side to the image side;
the focusing lens group includes an eleventh lens having positive optical power, a twelfth lens having positive optical power, and a thirteenth lens having negative optical power, which are arranged in order from the object side to the image side.
Preferably, the first lens, the third lens, the fourth lens, the sixth lens, the tenth lens and the thirteenth lens are all flint glass, and the second lens, the fifth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens and the twelfth lens are all crown glass.
Preferably, the zoom lens includes at least one cemented lens group cemented by adjacent lenses.
Preferably, the zoom lens further satisfies:
Figure BDA0003080268000000021
wherein,
Figure BDA0003080268000000022
the TTL is the total length of the zoom lens and is the diameter of the target surface covered by the zoom lens.
Preferably, the zoom lens further includes a stop STO, which is located between the zoom lens group and the second fixed lens group.
Preferably, the first fixed lens group and the second fixed lens group each include at least one lens satisfying:
1.43≤nd≤1.64,60≤vd≤96
where nd is a refractive index and vd is an Abbe number.
Compared with the prior art, the invention has the beneficial effects that:
1) By reasonably setting the focal length, the number and the shape of the lenses among the lens groups, the balance of the overall quality is ensured, the assembly tolerance among the lens groups is favorably reduced, the assembly is convenient, and the assembly precision of the lens is improved;
2) The focal power of the lens group is optimally distributed, the excellent confocal imaging capability of visible and infrared spectrums is realized, meanwhile, the temperature compensation function is realized, the problem of focus drift in high and low temperature environments is solved, virtual focus is not generated in the temperature range of-40-80 ℃, the resolution is good under the state of a large aperture, the clear imaging effect is achieved, and the application range is wide;
3) The overall length can be reduced while a larger field angle is ensured, the light transmission efficiency is effectively improved, the production cost is reduced, the lens size is small, the image surface is large, various types of camera equipment can be matched, and the use requirements are met;
4) The correction of chromatic aberration and secondary spectrum of 380-850nm wave band is realized by matching and combining crown glass and flint glass, and the resolving power can be ensured without refocusing during day and night switching.
Drawings
FIG. 1 is a structural view of a zoom lens according to the present invention;
FIG. 2 is a MTF diagram at a wide-angle end under normal temperature and visible light of the zoom lens of the present invention;
FIG. 3 is an MTF chart of the zoom lens of the present invention at the wide-angle end under-40 ℃ visible light;
FIG. 4 is an MTF chart of the zoom lens at the wide-angle end under +80 ℃ visible light according to the present invention;
FIG. 5 is a MTF diagram at a wide-angle end under normal temperature infrared light of the zoom lens of the present invention;
FIG. 6 is an MTF chart of the zoom lens of the present invention at a wide angle end under infrared light at-40 ℃;
FIG. 7 is an MTF chart at the wide-angle end under +80 ℃ infrared light of the zoom lens of the present invention;
FIG. 8 is a chart of MTF at the telephoto end under normal temperature and visible light of the zoom lens of the present invention;
FIG. 9 is a chart of MTF at the telephoto end under-40 ℃ visible light for the zoom lens of the present invention;
FIG. 10 is a chart of an MTF at the telephoto end under +80 ℃ visible light for the zoom lens of the present invention;
FIG. 11 is a diagram of an MTF at the telephoto end of the zoom lens of the present invention under normal temperature infrared light;
FIG. 12 is a chart of MTF at the telephoto end under infrared light at-40 ℃ in the zoom lens of the present invention;
FIG. 13 is a chart of MTF at the telephoto end under +80 ℃ infrared light for the zoom lens of the present invention.
Description of reference numerals: 1. a first fixed lens group; 2. a zoom lens group; 3. a second fixed lens group; 4. a focusing lens group; 5. an optical filter; 11. a first lens; 12. a second lens; 13. a third lens; 21. a fourth lens; 22. a fifth lens; 23. a sixth lens; 31. a seventh lens; 32. an eighth lens; 33. a ninth lens; 34. a tenth lens; 41. an eleventh lens; 42. a twelfth lens; 43. a thirteenth lens; STO, stop; IMA, image plane.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1 to 13, a zoom lens includes a first fixed lens group 1, a zoom lens group 2, a second fixed lens group 3, a focus lens group 4 and a filter 5, which are sequentially disposed from an object side to an image side along an optical axis, wherein when focusing, the zoom lens group 2 and the focus lens group 4 respectively move along the optical axis;
the zoom lens further satisfies the following condition:
1.32≤FA/FC≤1.97,-0.9≤FB/FC≤-0.18,0≤FD/FC≤1.1
FA is the focal length of the first fixed lens group 1, FB is the focal length of the zoom lens group 2, FC is the focal length of the second fixed lens group 3, and FD is the focal length of the focusing lens group 4.
In an embodiment, the zoom lens further satisfies:
0≤FW/FC≤0.5
where FW is the wide-angle end focal length of the zoom lens.
When the lens works, light rays sequentially pass through the first fixed lens group 1, the zoom lens group 2, the second fixed lens group 3 and the focusing lens group 4 to carry out light path adjustment, and then are imaged on an image surface through the optical filter 5, the zoom lens group 2 can move along an optical axis and is used for optical zooming of the zoom lens between a wide-angle end and a telephoto end, and the focusing lens group 4 can also move along the optical axis and is used for correcting the image surface position change of the zoom lens group 2 in the zooming process. And through rationally setting the focal length between each lens group, ensure whole quality equilibrium, be favorable to reducing the equipment tolerance between the lens group, be convenient for assemble and improve camera lens equipment precision.
In one embodiment, the first fixed lens group 1 has positive focal power, the zoom lens group 2 has negative focal power, the second fixed lens group 3 has positive focal power, and the focus lens group 4 has positive focal power.
In one embodiment, the first fixed lens group 1 includes, in order from the object side to the image side, a first lens 11 having negative optical power, a second lens 12 having positive optical power, and a third lens 13 having positive optical power;
the zoom lens group 2 includes a fourth lens 21 having negative power, a fifth lens 22 having negative power, and a sixth lens 23 having positive power, which are disposed in order from the object side to the image side;
the second fixed lens group 3 includes, in order from the object side to the image side, a seventh lens 31 having positive optical power, an eighth lens 32 having positive optical power, a ninth lens 33 having positive optical power, and a tenth lens 34 having negative optical power;
the focus lens group 4 includes an eleventh lens 41 having a positive power, a twelfth lens 42 having a positive power, and a thirteenth lens 43 having a negative power, which are disposed in order from the object side to the image side.
The lens realizes excellent confocal imaging capability of visible and infrared spectrums by optimally distributing focal power of the lens group and reasonably configuring the number and the shape of the lenses, has a temperature compensation function, solves the problem of focus drift in high and low temperature environments, does not have virtual focus in a temperature range of-40-80 ℃, still has good resolution in a large aperture state, achieves a clear imaging effect, and is wide in application range. It should be noted that, each lens group of the lens can also adjust the number and shape of the lenses at will while satisfying the focal power requirement.
In one embodiment, the first lens 11, the third lens 13, the fourth lens 21, the sixth lens 23, the tenth lens 34, and the thirteenth lens 43 are all made of flint glass, and the second lens 12, the fifth lens 22, the seventh lens 31, the eighth lens 32, the ninth lens 33, the eleventh lens 41, and the twelfth lens 42 are all made of crown glass. The correction of chromatic aberration and secondary spectrum of 380-850nm wave band is realized, and the resolving power can be ensured without refocusing during day and night switching.
In one embodiment, the zoom lens includes at least one cemented lens group cemented by adjacent lenses. So as to eliminate chromatic aberration and improve imaging quality.
In an embodiment, the zoom lens further satisfies:
Figure BDA0003080268000000061
wherein,
Figure BDA0003080268000000062
the TTL is the total length of the zoom lens and is the diameter of the target surface covered by the zoom lens.
The lens obtained by controlling the target surface diameter and the total length parameter of the zoom lens has small volume and large image surface, and can meet the use requirements of various types of shooting equipment.
In an embodiment, the zoom lens further includes a stop STO, which is located between the zoom lens group 2 and the second fixed lens group 3. The diaphragm STO is arranged behind the zoom lens group 2, so that the diaphragm STO is arranged behind the zoom lens group, the maximum aperture of the zoom lens can reach F1.4, the light incoming amount in a low-illumination environment is sufficient, the imaging brightness is ensured, and the imaging quality is improved.
In one embodiment, the first fixed lens group 1 and the second fixed lens group 3 each include at least one lens satisfying:
1.43≤nd≤1.64,60≤vd≤96
wherein nd is a refractive index and vd is an Abbe number.
The lens realizes the correction of chromatic aberration and secondary spectrum of 380-850nm wave band by controlling the material performance of the lenses in the first fixed lens group 1 and the second fixed lens group 3, such as adopting the matching combination of crown glass and flint glass, and can ensure good resolving power without refocusing when switching day and night.
Specifically, as shown in fig. 1, in the present embodiment, the first fixed lens group 1 has positive optical power, the zoom lens group 2 has negative optical power, the second fixed lens group 3 has positive optical power, and the focus lens group 4 has positive optical power. The first fixed lens group 1 includes three lenses, the zoom lens group 2 includes three lenses, the second fixed lens group 3 includes four lenses, and the focus lens group 4 includes three lenses. Wherein the first lens 11 is a meniscus lens having negative focal power, the second lens 12 is a meniscus lens having positive focal power, the third lens 13 is a meniscus lens having positive focal power, the fourth lens 21 is a biconcave lens having negative focal power, the fifth lens 22 is a biconcave lens having negative focal power, the sixth lens 23 is a meniscus lens having positive focal power, the seventh lens 31 is a biconvex lens having positive focal power, the eighth lens 32 is a biconvex lens having positive focal power, the ninth lens 33 is a biconvex lens having positive focal power, the tenth lens 34 is a biconcave lens having negative focal power, the eleventh lens 41 is a biconvex lens having positive focal power, the twelfth lens 42 is a biconvex lens having positive focal power, the thirteenth lens 43 is a biconcave lens having negative focal power, the first lens 11 and the second lens 12 form a cemented lens group, the ninth lens 33 and the tenth lens 34 form a second lens, the twelfth lens 42 and the thirteenth lens form a cemented lens group, the twelfth diaphragm lens 43 and the third lens group form a cemented variable lens group, and the cemented variable lens group.
The focal length settings in this example are shown in table 1:
TABLE 1
FA/FC 1.66
FB/FC -0.29
FD/FC 0.45
FW/FC 0.18
Total number of cemented lens groups 3
Each lens is a spherical lens, and specific relevant parameters include curvature radius, thickness, refractive index and abbe number, as shown in table 2:
TABLE 2
Figure BDA0003080268000000071
Figure BDA0003080268000000081
In table 2, the numbers are numbered according to the number of the optical surfaces, and since there are a plurality of cemented lens groups formed by cemented lenses, and the same number is used for the cemented surfaces, such as L1& L2, 33&34, 42&43, corresponding to the first cemented lens group, the second cemented lens group and the third cemented lens group, respectively. Therefore, in the present embodiment, the numbers S1 to S23 sequentially correspond to the mirror surfaces of the lenses arranged in order from the object side to the image side, and S24 and S25 are the object side mirror surface and the image side mirror surface of the filter 5, respectively.
The wide-angle end and telephoto end zoom parameters are shown in table 3, where: z1 is the distance between the first fixed lens group 1 and the zoom lens group 2, Z2 is the distance between the zoom lens group 2 and the second fixed lens group 3, Z3 is the distance between the second fixed lens group 3 and the focus lens group 4, and Z4 is the distance between the focus lens group 4 and the image plane.
TABLE 3
Wide angle end Long coke end
Z1 2.42 27.79
Z2 27.46 2.09
Z3 10.04 0.69
Z4 1.5 10.84
According to the relevant parameter settings of table 1, table 2 and table 3, fig. 2 to 4 are MTF graphs at the wide angle end of the lens under normal temperature, at-40 ℃ and at +80 ℃ visible light, fig. 5 to 7 are MTF graphs at the wide angle end of the lens under normal temperature, at-40 ℃ and at +80 ℃ infrared light, fig. 8 to 10 are MTF graphs at the telephoto end of the lens under normal temperature, at-40 ℃ and at +80 ℃ visible light, fig. 11 to 13 are MTF graphs at the telephoto end of the lens under normal temperature, at-40 ℃ and at +80 ℃ infrared light, respectively, and MTF does not decrease significantly. In conclusion, the lens has both infrared and visible light confocal capabilities, the zoom magnification is large through adjustment of Z1, Z2, Z3 and Z4, F1.4 large aperture can be realized, the size is small, the target surface is large, the full-focus section is confocal in day and night, virtual focus is avoided in the temperature range of-40-80 ℃, imaging is clear, and the application range is wide.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express the more specific and detailed embodiments described in the present application, but not should be understood as the limitation of the invention claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A zoom lens, characterized in that: the zoom lens is composed of a first fixed lens group (1), a zoom lens group (2), a second fixed lens group (3), a focusing lens group (4) and an optical filter (5) which are arranged in sequence from an object side to an image side along an optical axis, when focusing is carried out, the zoom lens group (2) and the focusing lens group (4) respectively move along the optical axis, the first fixed lens group (1) has positive focal power, the zoom lens group (2) has negative focal power, the second fixed lens group (3) has positive focal power, and the focusing lens group (4) has positive focal power, wherein:
the first fixed lens group (1) is composed of a first lens (11) with negative focal power, a second lens (12) with positive focal power and a third lens (13) with positive focal power which are arranged in sequence from the object side to the image side;
the zoom lens group (2) is composed of a fourth lens (21) with negative focal power, a fifth lens (22) with negative focal power and a sixth lens (23) with positive focal power which are arranged in sequence from the object side to the image side;
the second fixed lens group (3) is composed of a seventh lens (31) with positive focal power, an eighth lens (32) with positive focal power, a ninth lens (33) with positive focal power and a tenth lens (34) with negative focal power which are arranged in sequence from the object side to the image side;
the focusing lens group (4) is composed of an eleventh lens (41) with positive focal power, a twelfth lens (42) with positive focal power and a thirteenth lens (43) with negative focal power, which are arranged in sequence from the object side to the image side;
the zoom lens further satisfies the following conditions:
1.32≤FA/FC≤1.97,-0.9≤FB/FC≤-0.18,0≤FD/FC≤1.1
and FA is the focal length of the first fixed lens group (1), FB is the focal length of the zoom lens group (2), FC is the focal length of the second fixed lens group (3), and FD is the focal length of the focusing lens group (4).
2. The zoom lens according to claim 1, wherein: the zoom lens further satisfies:
0≤FW/FC≤0.5
wherein FW is a wide-angle end focal length of the zoom lens.
3. The zoom lens according to claim 1, wherein: the first lens (11), the third lens (13), the fourth lens (21), the sixth lens (23), the tenth lens (34) and the thirteenth lens (43) are all made of flint glass, and the second lens (12), the fifth lens (22), the seventh lens (31), the eighth lens (32), the ninth lens (33), the eleventh lens (41) and the twelfth lens (42) are all made of crown glass.
4. The zoom lens according to claim 1, wherein: the zoom lens comprises at least one cemented lens group formed by adjacent lenses through cementing.
5. The zoom lens according to claim 1, wherein: the zoom lens further satisfies:
0.05≤
Figure DEST_PATH_IMAGE002
/TTL
wherein,
Figure DEST_PATH_IMAGE004
and the TTL is the total length of the zoom lens and is the diameter of a target surface covered by the zoom lens.
6. The zoom lens according to claim 1, wherein: the zoom lens further comprises a stop STO, which is located between the zoom lens group (2) and the second fixed lens group (3).
7. The zoom lens according to any one of claims 1 to 6, wherein: the first fixed lens group (1) and the second fixed lens group (3) both comprise at least one lens, and the following conditions are satisfied:
1.43≤nd≤1 .64,60≤vd≤96
where nd is a refractive index and vd is an Abbe number.
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CN114994885B (en) * 2022-06-17 2023-09-01 湖南长步道光学科技有限公司 Full-frame optical system with micro-distance function and movie lens
CN115598804B (en) * 2022-11-30 2023-03-31 浙江大华技术股份有限公司 Optical lens and imaging device
CN117031715B (en) * 2023-02-21 2024-04-26 东莞市宇瞳光学科技股份有限公司 Zoom lens

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